Benzyl chloride. Benzyl chloride, or Î±-chlorotoluene, is an organic compound with the formula C6H5CH2Cl. This colourless liquid is a reactive organochlorine compound that is a widely used chemical building block.
Two slits are illuminated with red light (Î» = 650 nm). The slits are 0.25 mm apart and the distance to the screen is 1.25 m. What fraction of the maximum intensity on the screen is the intensity measured at a distance 3.0 mm from the central.
How far can I see with a telescope? Pretty far. Usually this question is asked when comparing two scopes, as in can I see farther with this telescope?. A bigger scope will show you more, but not necessarily farther. You don't really need to see farther, though. With the unaided eye, you can see 2.8 million light-years to the Andromeda Galaxy. Even a very small telescope can show you an object called 3C273, a quasar in Virgo that is 3 billion light-years distant. But most objects that are interesting to look at aren't that far away. What you really want with a telescope is light-gathering power to see fainter things, not farther things.